Dishwashing apparatus



Aug. 4, 1953 DISHWASHING APPARATUS 5. Sheets-Sheet 1 Filed June 16. 1947g- 1953 o. J. BORN-GESSER ETAL 2,647,528

DISHWASHING APPARATUS Filed June 16, 1947 5 Sheets-Sheet 2 gWaJDISHWASHING APPARATUS 5 Sheets-Sheet 3 Filed June 16. 1947 Aug. 4, 1953o. J. BORN GESSER ET AL 2,647,528

DISHWASHING APPARATUS Filed June 16. 1947 5 Sheets-Sheet 4 Aug. 4, 1953o. J. BORNGESSER ET AL 2,647,528

I DISHWASHING APPARATUS Filed June 16. 1947 v 5 Sheets-Sheet 5 PatentedAug. 4, 1953 DISHWASHIN G APPARATUS Otto J. Borngesser, Baltimore, Md.,Richard B. Bradshaw, Philadelphia, and Charles C. Smith, Warrington,Pa., assignors to Kaiser Metal Products, Inc., a corporation ofCalifornia Application June 16, 1947, Serial No. 754,918

11 Claims. (Cl. 134-200) This invention relates to timing device andmore particularly to a device of this character for automaticallyinitiating in their proper timed relation, the series of steps whichoccur in the operation of a dish-washing machine.

The usual dish-washing machine involves a se- 'quence of steps oroperations which are carried out to most eflectively clean the dishes.The first step should be one which merely supplies fresh water to washoff the loose residue. After a short interval of time for thispreliminary wash, the dishes should be subjected to the washing actionof a liquid containing soap or some other detergent. In this operation,it is important that the wash water be re-used so that the soap'ordetergent is not wasted and during this time-the drain should thereforebeclosed. This cleansing operation should proceed for a moderate -lengthof time and thereafter the drain should be opened so that the wash watercan flow away from the dishes. Thereafter, the dishes should be sprayedwith fresh water for a short period of time to remove any traces of thesoap or detergent which may be left upon the dishes. Following thisfinal washing step, the fiow of wash water should be cut off so that thedishes can dry and in order to best permit this drying action, the coverof the machine should be opened so that the moisture-laden air canescape and the relatively drier air of the atmosphere can come intocontact with and serve to dry the dishes.

The timing device of the present invention initiates these several stepsin their proper sequential order and, moreover, carries out each stepduring the proper time interval. steps have once been set in operationby a person, they proceed in their regular order until the dishes arewashed and, thereafter, the cover is opened so that the dishes will dryand the complete operation Will have been carried out.

It is an important feature of the invention that the timing device isactuated by the water pressure of the supply of water which is utilizedto Wash the dishes. As a consequence, the timing device is of simpleconstruction and makes use of the same water connection established forwashing the dishes.

A preferred embodiment of the invention is illustrated in theaccompanying drawings in After these Figure 6 is a sectional view on theline 6-6 of Figure 5, and I Figure 7 is a left hand side elevationalview of the linkage and shaft of Figure 6.

The dish-washing machine which is here i1- lustrated includes a tub orshell It having a cylindrical side wall H, and a bottom wall l2. At thetop of the tub I0 is a top plate l3, which is flush with the top rim ofthe side wall I I. A lid or cover plate It for the shell I!) is pivotedabout hinge shafts IE to the rearward portion of the top plate It.Springs l5 are positioned upon the shafts I5 and are under such torsionthat they tend to lift up the cover plate 14 to an open position.

To hold the cover plate It downwardly in its closed position it isprovided with a depending pin I? (see Fig. 2) at its forward free edge,and pin I1 is formed with an upwardly facing shoulder 18 at its lowerend. A retractable latch I9 engages over shoulder I8 to hold the coverplate in its downward position. The latch I9 is provided with anenlarged tail portion 2| and the latch I9 is guided for reciprocatorymotion toward and away from the pin ll by means of guide rails 22 onopposite sides of the latch. These rails are carried on the under-sideof top plate IS. A pin 23 projects from the latch I 9 through one orboth of the guide rails 22 to limit the endwise movement of latch l9.

A spring 24 bears against the enlarged portion 25 to urge the latch I9toward the pin 11. It will be observed that the engaging end of latch I9is bevelled so that a mere downward motion on the cover plate M willserve to force the latch l9 to a retracted position against the actionof spring 2 1 so that the shoulder Hi can become engaged under the latchI9. To disengage the latch l9, a pull rod 25 is provided and this pullrod has an inturned end which enters a slot 26 in the tail portion 2| ofthe latch. A spring 21 urges the pull rod 25 in a direction which tendsto disengage the latch, but it ha insufiicient pressure to bring thisaction about and serves merely to hold the parts in the properrelationship until a pull is exerted upon rod 25 at the proper time.This means for exerting a pull upon the rod 25 will be described later.

A bracket 28, depending from the top plate l3, provides a seat forspring 24 and also for spring 21, to back them up. Rod 25 passes througha hole in bracket 28.

Rotatably mounted within the tub It is any suitable means for supportingthe dishes to be washed. As a suitable construction for this purpose iswell known, an illustration of this detail has not been included but itwill be understood that any open basket formation may be utilized. It ishere contemplated that th basket, or like carrier, will be rotatableabout a center vertical diately escape into the drain 33.

pivot so that the basket may rotate and bring all faces of all of thedishes into the streams-of water which are to elect the cleansingaction.

These streams of water are projected upwardly from the bottom wall 52 ofthe tub. As here shown, this is accomplished by providing a plurality ofjets which pass through fluid tight openings in the bottom wall ll? ofthe tub. All of the jets til are connected to a common pipe 3 l whichserves as a manifold, and the pipe 3i is connected at 32 to the timingdevice. illustrated apparatus, all or most of the jets to are inclinedfrom the vertical so that they will direct streams against the dishes atsuchan angle that the carrier for the dishes will thereby -'be rotated.about its support. However, it is to be understood that the invention isequally as applicable to a dish-washer having a motor drivendish-carrier and other types of water projecting means for washing thedishes.

- The bottom wall it of the shell it preferably slopes downwardly to adrain 33 as is best shown in Figure 6. The drain 33 is provided with aninner guide surface 3% and with anupwardly facing valve seating surface35. able within the guide surface it is a tubular valve member 35 whichperforms the combined Vertically 'movfunction or" a valve head to closethe drain and also serves to maintain a given level of water Within thetub ill.

The valve member 36 is In the formed at a point approximately centrallyof its height with a peripheral flange which provides a valve seatingsurface 3? to rest upon the seating surface 35. When th member as is inits lowercontact with each other, liquid cannot imme- When the member islifted, however, openings 38 in the side wall of the member 35 belowflange 3'5 are opened to the interior of the tub ill so that the watercan freely pass into the drain.

' The top of tubular member 35 is open so that water can flow over thetop rim or edge 39 and into the tubular member and then pass downwardlyinto the drain. Therefore, when the member 35 is in its lowermostposition and valve seating surfaces 35 and 3! are in contact with eachother, the water within the shell ill cannot immediately pass into thedrain 33, but after the level of the water has risen to the-top edge 39of member 36 the water can enter this open top and fall into the drain.

It will, therefore, be appreciated that the position of therim3911pwardly within the shell is determines the level of the liquid whichwill be maintained in the shell it after the valve member 36 hasdescended to its lower position.

I It may be mentioned at this point that during the washing step inwhich soap or a detergent is-in the body of water being maintained 'at'the bottom of the tub it, the streams of water issuing from the jets topick u this soapy water and project it against the dishes. For thisreason, the orifices of the jets Bil are below the top rim 3% of thevalve member 3? and as a consequenc the streams of fresh water from the.

jets to will be projected through the soapy body of Water and carry aconsiderable amount of this soapy water upwardly against the wishes.

It may also be mentioned at this point that during the initial flushingaction with fresh water to wash off the residue on the dishesthere willnot be sufficient height of water accumulated in the bottom of the tubis to overlie the jets as. As a consequence there will not be a pick-upof directed upon the dishes.

to mov'e to its downward position. shaft 52 this arcuate movement alever is affixed to shaft '32 and a pull rod G5 is pivotally chamber it.

water from the bottom of the tub and the full strength of the streamsfrom the jets will be These strong streams will remove the loose foodparticles from the dishes. After a sufficient amount of water hasentered the tub so that it overlies the jets fill, the soaoy wstor willbe carried against the dishes to effect the thorough Washing operation.After thew'ashing operation is over the valve member 36 must be liftedto its upper position so that :thesoapy water can drain away and also sothat the fresh water which is introduced to remove 'th'e s'oapy'n1aterial from the dishes will also immediately escape through thedrain 33.

To operate the valve member 36, a shaft it which passes transverselythrough the drain 33 is" provided. This shaft d2 has thereto a cam 43 sothat an arcuate rotation of the shaft 142' willcause the cam 33 to bearagainst the underside of a cross bar ll of valve member 36 and leftmember 3G, or conversely, to permit it To give the connected to theouter end of lever The means for operating the pull rod d5 will beexplained later.

The timing device of the invention performs several functions. Itoperates the pull rod 55 which serves to lift and lower the valve men ortithe pull rod'iiS which serves to retract the 'latchlfi, and it alsodelivers liquid into the mani- 'fold pipe 31 at and for the roper periodof time. 'Thus,"the addition of the timing device, to the dishwashingmachine makes t operation of the machine fully automatic.

The'timing device includes a body 33 which has a lower cylindricalchamber Chamber it is closed at its lower end by a cover plate :39 whichis affixed to the body ll. i is upper portion of body ill is formed witha cylindrical chamber 5!, which is of less diameter than the Chamber Mis in axial alignment with the cylindrical chamber 'Operating within thechambers t8 and iii is a piston 52. The lower portion of piston isenlarged to fit the cylindrical surface ii and a packing material 53therein provides a liquidtight seal between the lower end of the pistonand the surface 48. The piston 52 passes upwardly through the top of thebody ll and a packing material 5 5 carried by the body ll preventsescape of liquid to the outside of the body around piston 52. Above thelowermost end of piston 52, it is formed with a peripheral flange inwhich is located packing material This packing material at 55 is insealing engagement with the inner surface of the cylindrical chamber"5!." Above the sealing material 55 the piston 52 is formed with ashoulder which limits the upward ,movement of the piston 52 by contactagainst the body ll.

Extending transversely of the body ll is a bore 5'|"58 and it will beobserved that the bore portion5l is on one side of the chamber d3 andthat the bore portion 58 is on the other side of chamber 48. Also, thebore 5'l-5il is positioned between the chamber 33 and the smallerchamber 5! and therefore communicates with both of these chambers. Thisbore ill-53 may be formed by drilling cross-wise through the body ll andthereafter closing the ends by means of plugs 59.

The bore at 5'! receives the water which is supplied under pressure.Although water may be delivered directly to this bore 51, in the presentembodiment of the invention, a sieve 6i is provided in the path of theincoming stream to serve to filter the incoming water. The filter screen6| is positioned in a chamber 62 which is formed in the body 41 to oneside of the cylindrical chamber 48. The upper end of the screen 6! isopen and seats against an internal shoulder 63 formed at the top ofchamber 62. A plug 64 is screwed into the lower end of chamber 62 toclose it and this plug 64 bears against a spring 65 carried by the lowerend of screen 6! so that the screen BI is urged upwardly into sealingengagement with the shoulder 63.

An inlet opening 66 is formed in the side wall of chamber 52 and thesupply pipe 6! is connected to a source of water to supply water underpressure through this opening 66 and into the chamber 62. It is apparentthat the water must all flow through the screen 6! in order to enter theinlet bore 51.

The outlet bore 56 communicates with a passageway 6B which is formed inthe body ll and opens outwardly at the bottom or this body 41.

From the lower end of passageway 68 is a port 69 which enters into thelower end of the cylindrical chamber 48. The lowermost end of passageway68 is closed by means of a plug 1 I.

It is apparent that the incoming water can flow from the inlet borearound the piston 52 and into the outlet bore 58, and can thereafterflow downwardly through the passageway 66 and through port 69 into thecylindrical chamber it. To restrict this flow so that only a smallamount of water can bleed into the chamber 13, a capillary tube 12 ispositioned within the passageway 68. This capillary tube '82 may besupported in position by having it attached to a sleeve 13, threadedinto the lower part of passageway 68.

The opening through the capillary tube 12 should be so small that inconjunction with the length of this capillary tube i2 only a smallamount of water can pass through the tube in a definite time interval.It has been found that the use of this capillary tube is moresatisfactory to regulate the flow and obtain a uniformity of operationthan could be achieved for example by means of a simple small portopening.

It will be apparent that the water which is supplied to the under-sideof piston 52 through port 69 will force the piston 52 upwardly to theposition of Figure 3. Although the water is also acting downwardly uponthe upper side of the flange at the lower end of piston 52, since theunder-side of piston 52 has a greater effective area, the piston 52 willbe pushed upwardly. However, it will be apparent that if the waterpressure below piston 52 is allowed to escape, the water pressure actingdownwardly on piston 52 will cause the piston 52 to move downwardly.

To permit the escape of the water beneath piston 52, the lower part ofcylindrical chamber 48 is provided with an outlet opening M. The outletopening M communicates with a chamber (Fig. 4) which in turncommunicates with a passageway 16. The passageway 26 is connected bymeans of a pipe Tl to the drain 33. The flow of fluid from the chamber15 into the passageway !6 is controlled by a valve head 18 carried atthe lower end of a valve rod E9. The valve rod 19 passes upwardlythrough the body 41 and escape of water is prevented by a packingmaterial 8| carried by the rod It. A spring 82 surrounds the valve rodi9 outside of the body i! and bears at its lower end upon the body 41and at its upper end against a ring 83 affixed to. the valve rod, tourge the valve head 18 to closed position.

Spring 82 therefore serves to hold the valve head 18 on its seat so thatthe water which has entered the cylindrical chamber 48 through port 69cannot escape into the pipe I! and into the drain 33. To unseat thevalve head it a push button 84 is afiixed to the top end of rod 79 andthis push button 34 is located in an opening in the top plate I3 so thatit is readily available to the operator.

When the valve head 78 is upon its seat, the Water cannot escape fromthe cylindrical chamber 48 and consequently the piston 52 is forced toits uppermost position. As has been mentioned, this is because theexposed area on the under side of the piston 52 is greater than theeffective area on the upper side of the piston 52. So long as the valvehead it remains upon its seat, therefore, the piston 52 will remain inits uppermost position and the incoming water supply will be sealedwithin the timing body. The water cannot escape above packing material55 and it cannot escape out of chambers t8 and 15. However, when thevalve head it is removed from its seat by manually depressing the button84 the liquid within the cylindrical chamber 43 will escape past thevalve head 18 and through pipe 11 into the drain 33.

As the water pressure beneath the piston 52 will be relieved when valvehead it is opened, the force exerted by the incoming water upon theupper effective surface of the piston 52, will cause the piston 52 torapidly descend to its lowermost position. This descent of piston 52will not be interfered with by the water bleeding into the chamber 43through port 69, because of the extremely small size of the openinthrough capillary tube 12 relative to the outlet opening it and thecommunication from this outlet opening to the drain.

From Figure 3 it will be apparent that as soon as the packing material55 has moved below the surface 5| the water within the inlet bore 51 canpass around the piston 52 and into an outlet opening 86 in the upperpart of the timer body. The outlet opening 86 is connected by theaforesaid coupling means 32 to the manifold pipe 3! which supplies waterto the jets 36 within the tub it]. During the time that the packingmaterial 55 is below the surface 5| the Water supplied through incomingpipe 6? will pass through the timer body and into the manifold pipe 3|and during this entire same period of time streams of water willcontinue to issue from the jets 35.

As a safety provision in the event of a failure in the water supply, anair inlet one-Way valve is provided. This valve 8? is contained in abored plug 58 and so long as the water pressure is maintained the valvetil will be forced to an upper position and against its seat to preventescape of water from the bored plug 88. However, if a failure of thewater pressure supply occurs so that a suction occurs in the supply pipe6?, the valve 3'? will immediately drop and permit air to enter throughthe bored plug 88 and through the timer body and into the supply pipe6'5. This will prevent the possibility of the wash Water Within thebottom of the tub I!) from being sucked into the water supply andthereby causing its contamination.

It has been pointed out that the timing mechanism serves to unlatch thecover H5 at the proper time so that when the dishes are cleaned thiscover will automatically open. To accomplish this purpose the uppermostpart of the piston 52 is formed with a flanged enlargement ti such as byafliring a washer to the upper part of piston 52 by means oia screw St.A. trip lever e2 ispivotally attached to a bracket 93 secured to thetimer body. The pull rod 35 is pivotally connected to one arm of leverQ2 and the other arm of trip lever 532 extends into the path of theflanged enlargement St at the top of piston 52.

During the downward movement of piston 5'2 from its position in Figure 3the flanged enlargement 8i will swing the trip lever 32 in a directionto exert a push upon the rod and because of the slot connection at 25this will have no effect on the latch it. Tiowever, during the upwardmovement of the piston 52, when the flanged enlargement 8i stri.:esagainst the trip lever til a pull will be exerted upon the rod 25 andthis in turn will withdraw the latch is? from the shoulder it andrelease locking pin ll. As a consequence the springs 56 will swing thecover or lid i i upwardly to an open position.

It has also been mentioned. that the timing device serves to open andclose the drain valve it at the proper times. To accomplish theseoperations, a pin or stud s5 is affixed to the uppermost part of thepiston 52 by means of screw iii The upper end of the pull rod it isformed with an enlarged head 9% which is slotted, and pin 95 engages inthis slot. As been pointed out, pull rod it actuates the lifting cam tswhich acts upon the valve member Elli. The slottedconnection between pin95 and head permits a lost motion connection so that the longer travelof piston relative to the necessary movement of rod 55 will beaccommodated and so that valve will not be lifted until the proper time.

The timing device may be supported in any convenient manner. As hereshown, a bracket plate 97 is secured as by welding to the outer side ofthe tub it. The body is attached to plate Si? by means of bolts :35which pass through bosses iill oi the body ll.

In considering the complete operation of the mechanism it may first bepointed out that during stand-by periods, the water pressure from supplypipe Ell is maintained within the cylindri al chamber do on the underside of piston 52 to keep this piston in its proper position. Thepacking material during this time serves as a lvalve to prevent thewater from passing to the outlet opening and into the manifold pipe 3%.Also, as valve it will be upon its seat, water cannot escape from thechamber ill and there will consequently be no loss of water from thewater supply. When the machine is to be used for washing dishes, thedishes are placed in the basket or other dish carrier within the shellor tub iii and the lid i l is then closed. The latch ill will engage theshoulder it of pin l! to hold the lid down against the action of springsit. It will be observed that at this time the drain valve 36 is held inits open position by means or the pin 95 which is holding pull rod A5 inits upper position.

When the push button at is depressed to initiate the washing action,valve i8 is removed from its seat and the Water beneath piston 52escapes through opening it, through pipe ii and into drain 33. Thepiston 52 thereupon moves downwardly rapidly and as soon as the packingmaterial 55 passes below the surface 5| the incoming water is permittedto flow into the outlet 38 and through outlet pipe iii to the jets 39.

When the piston 52 has reached its lowermost position the seatingsurface 3'5 of drain valve member 36 will rest upon its seat so that theinfiowin water cannot escape from tub Iii. At this time the push buttonEl i must be released and the soap or other detergent must be added tothe tub lil.

During the initial period that the water is flov ing through jets 38,the fresh water will impinge upon the dishes to remove the loose residuewhich is upon them. These will be strong streams, b cause not enoughwater will have entered the tub to overlie the jets 38.

The water which is entering throu h jets fit! into the tub ill willcollect at the botto of the tub it until it reaches the top rim of valvemember 35:. As has been pointed out e position of this top of valvemember determines the liquid level which will exist ..n the tub l6during the washing operation. it has been pointed out,.also, that duringthis was ing step the fresh water issuing from passes through the bodyof soapy water Fob the bottom of the tub iii and carries the soapyview-i against the dishes.

When valve '58 is permitted to close by releasing the push button thewater which is bleeding into the cylindrical chamber 15; from the portlit will serve to gradually move the piston in an upward direction. Asthe water devered to chamber it must pass through the ca llary tube 6 itevident that a prolonged period of time v' l required to move the p stonthrough its entire upward movemen By a proper selection of the capillarytube E2 the time interval for the complete rise of piston 52 can bepredeter- "lined.

When the piston o2 has moved upwardl far enough for the pin to movethrough. the full length of the slotted head lit,

action which then occurs water will from the outlet 05 and from the pipe3%. As soon as this has occru'red, g largement ill at the top of thepiston should strike against the trip lever to exert a pull on rod 25.This will withdraw the latch from the shoulder t8 and release pin ll sothat the cover or lid M can swing upwardly to an opened cosition underthe action of springs L The timing mechanism has at this time assumedits normal stand-by position, so that when the net washing operation isintended to take place the cycle of events which has just been describedmay be repeated.

What is claimed is:

l. The combination with a dishwashin machine having spray jets fordirecting the water upon the dishes, of a device for determining theamount of time during which the water flows to said jets, said devicecomprising a body with an internal cylindrical chamber, having a waterinlet and an outlet, said inlet being connectable to a source of waterunder pressure and said outlet being connectable to said spray jets,valve means including a reciprocating piston within said chamberactuated by and controlling the flow of water from said inlet to saidoutlet, said piston having means mounted thereon and below the waterinlet and outlet forming a liquid-tight seal with the wall of saidchamber and means including a capillary tube for by-passing a reducedflow of water from said inlet to the said chamber below said sealingmeans whereby the action of said piston in moving said valve means toopen position is restricted.

2. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes of a device for determining theamount of time durin which the water flows to said jets said devicecomprising a body with an internal cylindrical chamber having a waterinlet and an outlet, said inlet being connectable to a source of waterunder pressure and said outlet being connectable to said spray jets,valve means including a reciprocating piston within said chamberactuated by and controlling the ilow of water from said inlet to saidoutlet, said piston having means mounted thereon and below the waterinlet and outlet forming a liquid-tight seal with the wall of the saidchamber, means including a capillary tube for by-passing a reduced howof water from said inlet to said chamber below said sealing meanswhereby the action of said piston in moving said valve means to an openposition is restricted and said body having a second outlet from saidchamber for exhausting the water acting on the under side of said pistonthereby permitting the movement of said valve means to open position,and valve means for opening and closing said second outlet, said lastmentioned valve means being operable independently of the level of waterin said dishwashing machine.

3. The combination with a dishwashing machine having spray jets todirect the water upon the dishes and a valved drain outlet, of a devicefor determining the amount of time the water flows to said jets, saiddevice comprising a body with an internal cylindrical chamber, having awater inlet and an outlet, said inlet being connectable to a source ofwater under pressure and said outlet being connectable to said sprayjets, valve means including a reciprocating piston within said chamberactuated by and controlling the fiow of water from said inlet to saidoutlet, said piston having means mounted thereon and below the waterinlet and outlet forming a liquid-tight seal with the wall of the saidchamber, said piston also being operatively connected to said valveddrain whereby upon a predetermined movement of said piston said valveddrain is opened and means for by-passing a reduced flow of water intosaid chamber below said sealing means and for urging said piston to movesaid valve means to a closed position.

4. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes and a latched cover biased to openposition, of a device for determining the time the water flows to saidjets, said device comprising a body havin an internal cylindricalchamber provided with an inlet and an outlet,

said inlet being connectable to a source of water under pressure andsaid outlet being connectable to said spray jets, valve means includinga reciprocating piston actuated by and controlling the flow of waterfrom said inlet to said outlet, said piston having means mounted thereonand below the water inlet and outlet forming a liquid-tight seal withthe wall of the said chamber, said piston also being operativelyconnected to said cover whereby said cover is unlatched upon apredetermined movement of said piston and means for by-passing a reducedflow of water into said chamber below said sealing means and for urgingsaid piston to move said valve means to a closed position.

5. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes, a latched cover biased to openposition and a valved drain outlet, of a device for determining thelength of time the water flows to said jets, said device comprising abody having an internal cylindrical chamber provided with an inlet andoutlet, said inlet being connectable to a source of water under pressureand said outlet being connectable to said spray jets, valve meansincluding a reciprocating piston within said chamber actuated by andcontrolling the flow of water from said inlet to said outlet, saidpiston having means mounted thereon and below the water inlet and outletforming a liquid-tight seal with the wall of the said chamber, meansoperatively connecting said piston to said cover and said valved drainwhereby upon predetermined movements of said piston said cover isunlatched and said valved drain is opened, and means for by-passing areduced flow of water into said chamber below said sealing means and forurging said piston to move said valve means to a closed position.

6. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes, of a device for determining theamount of time during which the water flows to said jets, said devicecomprising a body having difierentially diametered, coaxial internalchambers in open communication with one another, said body also having awater inlet at the point of juncture of said chambers, and an outletfrom the smaller chamber at a point remote from the larger chamber,valve means including a reciprocating piston within said chambersactuated by and controlling the flow of water from said inlet to saidoutlet, said piston having means mounted thereon and below the waterinlet and outlet forming a liquid-tight seal with the wall of the largerchamber and means including a capillary tube for by-passing a reducedflow of water from said inlet to said larger chamber below said sealingmeans whereby the movement of said piston in opening said valve means isrestricted.

7. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes, of a device for determining theamount of time during which the water flows to said jets, said devicecomprising a body having dififerentially diametered coaxial internalchambers in open communication with one another, said body also having awater inlet at the point of juncture of said chambers and an outlet fromthe smaller chamber at a point remote from the larger chamber, valvemeans including a reciprocating piston within said chambers actuated byand controlling the flow of water from said inlet to said outlet, saidpiston having means mounted 11 thereon and below the water inlet andoutlet forming a liquid-tight seal with the wallof the larger chamber,means including a capillary tube for by-passing a reduced flow of waterfrom said inlet to said larger chamber below said sealing means wherebythe movement of said piston within said larger chamber and in openingsaid valve means is restricted and said body having an-outlet from saidlarger chamber for exhausting the water acting on the piston within saidlarger chamber, whereby the movement of said valve means to openposition is permitted, and valve means for opening and closing saidsecond mentioned outlet, said last mentioned valve means being operableindependently of the water level in said dishwashing machine.

8. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes and a valved drain, of a device fordetermining the amount of time during which the Water flows to saidjets, said device comprising a body having differentially diameteredcoaxial internal chambers in open communication with one another, saidbody also having a water inlet at the point of juncture of said chambersand an outlet from the smaller chamber at a point remote from the largerchamber, valve means including a reciprocating piston within saidchambers actuated by and controlling the how of water from said inlet tosaid outlet, said piston having means mounted thereon and below thewater inlet and outlet forming a liquid-tight seal with the wall of thelarger chamber, means for lay-passing a reduced flow of water from saidinlet to said larger chamber below said sealing means whereby movementof said piston within said larger chamber is restricted and meansoperatively connecting said piston to said valved drain whereby upon apredetermined movement of said piston said'valved drain is opened.

9. The combination with a dishwashing machine having spray jets fordirecting the water uponthe dishes, a latched lid biased to openposition and a valved drain, or" a device for determining the amount oftime during which the water flows to said jets, said device comprising abody having differentially diametered coaxial internal chambers, in opencommunication with one another, said body also having a water inlet atthe point of juncture of said chambers and a an outlet from the smallerchamber at a point remote from the larger chamber, valve means includinga reciprocating piston within said chambers actuated by and controllingthe flow of water from said inlet to said outlet, said piston havingmeans mounted thereon and below the water inlet and outlet forming aliquid-tight seal with the wall of the larger chamber, means including acapillar tube for by-passing a reduced flow of Water from said inlet tosaid larger chamber below said sealing means whereby movement of saidpiston within said larger chamber isrestricted and means operativelyconnecting said piston to said valved drain and said latched lid wherebyupon predetermined movements of said piston said valved drain and saidlatched lid are opened.

10. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes, a latched lid biased to openposition and a valved drain, of a devicefor determining the amount oftime during which the water flows tosaidjets, said device comprising abody having difierentially diamete-redcoaxial internal chambers in opencommunication with one another, said body also having a water inlet atthe point of juncture of said chambers and an outlet from the smallerchamber at a point remote from the larger chamber, valve means includinga reciprocating piston within said chambers actuated by and controll ngthe flow of water from said inlet to said outlet, said piston havingmeans mounted thereon below the water inlet and outlet forming aliquid-tight seal with the Wall of the larger chamber, means including acapillary tube for by-passing a reduced flow of water from said inlet tosaid larger chamber below said sealing means, whereby movement of saidpiston within said larger chamber is restricted, a valve operativeindependently of the water level in said dishwashing machine andcontrolling an outlet from said larger chamber for exhausting the wateracting on the piston within said larger chamber, and means operativelyconnecting said piston to said valved drain and said latched lid,whereby upon predetermined movements of said piston said valved drainand said latched lid are opened.

11. The combination with a dishwashing machine having spray jets fordirecting the water upon the dishes, and a latched lid biased to openposition, of a device for determining the amount of time during whichthe water iiows to said jets, said device comprising a body havingdifferentially diametered coaxial internal chambers in opencommunication with one another, said body also having a water inlet atthe point or juncture of said chambers and an outlet from the smallerchamber at a point remote from the larger chamber, valve means includinga reciprocating piston within said chambers actuated by and controllingthe flow of water from said inlet to said outlet, said piston havingmeans mounted thereon and below the water inlet and outlet forming aliquid-tight seal with the wall of said larger chamber means including acapillary tube for by-passing a reduced flow of water from said inlet tosaid larger chamber below said sealing means whereby movement of saidpiston within said larger chamber is restricted, operatively connectingsaid piston to said latched lid whereby upon a predetermined movement ofsaid piston said latched lid is opened, and a valve operativeindependently of the water level in said dishwashing machine andcontrolling an outlet from said larger chamber for exhausting the wateracting on said piston within said larger chamber.

OTTO J. BORNGESSER. RICHARD B. BRADSHAW. CHARLES C. SMITH.

References Cited in the file of this patent UNITED STATES PATENTS

